Holders Worcestershire Rapids have been drawn against Notts Outlaws in the first semi-final of the Vitality Blast.
They will take on the Outlaws on finals day at Edgbaston on Saturday, September 21 with the match getting underway at 11am.
In the other semi-final Derbyshire Falcons – who will appear at finals day for the first time – will do battle with Essex Eagles beginning at 2.30pm
The final is scheduled to start at 6.45pm.
Former England batsman Mark Butcher made the draw live on Sky Sports.
Three teams who featured in the North Group – the Rapids, Outlaws and Falcons – have advanced through to finals days.
The Rapids are the only one of the four sides who qualified for the 2018 finals day to book a return visit 12 months later.
Derbyshire Falcons win over Gloucestershire at Bristol means that all four sides batting second in the quarter-finals progressed through to finals day.
Essex Eagles won away to Lancashire Lightning, Notts Outlaws defeated visiting Middlesex, The Rapids overcame Sussex Sharks and the Falcons have chased down a 137 target at Bristol.
This season the Rapids triumphed over the Outlaws by 28 runs at Trent Bridge in their opening game of the campaign.
The return match at Blackfinch New Road was a wash-out.